51201100044 has 36 divisors (see below), whose sum is σ = 129517642800. Its totient is φ = 17054817120.

The previous prime is 51201100043. The next prime is 51201100057. The reversal of 51201100044 is 44000110215.

51201100044 is a `hidden beast` number, since 512 + 0 + 110 + 0 + 0 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51201100043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 457947 + ... + 558674.

It is an arithmetic number, because the mean of its divisors is an integer number (3597712300).

Almost surely, 2^51201100044 is an apocalyptic number.

It is an amenable number.

51201100044 is an abundant number, since it is smaller than the sum of its proper divisors (78316542756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51201100044 is a wasteful number, since it uses less digits than its factorization.

51201100044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018030 (or 1018025 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 51201100044 its reverse (44000110215), we get a palindrome (95201210259).

The spelling of 51201100044 in words is "fifty-one billion, two hundred one million, one hundred thousand, forty-four".